//
//  ConfirmationNsnull.m
//  ChatDemo-UI2.0
//
//  Created by syun on 16/5/19.
//  Copyright © 2016年 syun. All rights reserved.
//  处理接收后台json的NSnull类型

#import "ConfirmationNsnull.h"

@implementation ConfirmationNsnull
#pragma mark - 私有方法

//将NSDictionary中的Null类型的项目转化成@""

+(NSDictionary *)nullDic:(NSDictionary *)myDic

{
    
    NSArray *keyArr = [myDic allKeys];
    
    NSMutableDictionary *resDic = [[NSMutableDictionary alloc]init];
    
    for (int i = 0; i < keyArr.count; i ++)
        
    {
        
        id obj = [myDic objectForKey:keyArr[i]];
        
        
        
        obj = [self changeType:obj];
        
        
        
        [resDic setObject:obj forKey:keyArr[i]];
        
    }
    
    return resDic;
    
}


//将NSArray中的Null类型的项目转化成@""

+(NSArray *)nullArr:(NSArray *)myArr

{
    
    NSMutableArray *resArr = [[NSMutableArray alloc] init];
    
    for (int i = 0; i < myArr.count; i ++)
        
    {
        
        id obj = myArr[i];
        
        
        
        obj = [self changeType:obj];
        
        
        
        [resArr addObject:obj];
        
    }
    
    return resArr;
    
}


//将NSString类型的原路返回

+(NSString *)stringToString:(NSString *)string

{
    
    return string;
    
}


//将Null类型的项目转化成@""

+(NSString *)nullToString

{
    
    return @"";
    
}


#pragma mark - 公有方法

//类型识别:将所有的NSNull类型转化成@""

+(id)changeType:(id)myObj

{
    
    if ([myObj isKindOfClass:[NSDictionary class]])
        
    {
        
        return [self nullDic:myObj];
        
    }
    
    else if([myObj isKindOfClass:[NSArray class]])
        
    {
        
        return [self nullArr:myObj];
        
    }
    
    else if([myObj isKindOfClass:[NSString class]])
        
    {
        
        return [self stringToString:myObj];
        
    }
    
    else if([myObj isKindOfClass:[NSNull class]])
        
    {
        
        return [self nullToString];
        
    }
    
    else
        
    {
        
        return myObj;
        
    }
    
}

@end
